Which one of the following statements is not a tautology?

Logical Statement $p \to q$ is false if and only if $p$ is true and $q$ is false.

So, when $p$ is false, $q$ is true, \left(p ∨ q\right) \to \left(p ∨ ~ q\right) will be false.

Clearly \left(p ∨ q\right) \to \left(p ∨ ~ q\right) is not a tautology.